New Meteor + ReactJS video coming out in the next few days! Sorry about the delay guys. Been busy with job interviews.
Here is the script for you to copy - //cdnjs.cloudflare.com/ajax/libs/react/0.13.0/react.min.js
And here is the finished codepen - http://codepen.io/DevCoffee/pen/GZQaXb
Want to learn React + Webpack in more depth, check out survivejs - http://survivejs.com/